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fgs-thrust.xml
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<?xml version="1.0"?>
<!-- Copyright (c) 2024 Josh Davidson (Octal450) -->
<PropertyList>
<filter>
<name>A/THR Knots Lag</name>
<type>exponential</type>
<input>/instrumentation/airspeed-indicator/indicated-speed-kt</input>
<output>/it-autoflight/internal/athr-kts-input-lag</output>
<filter-time>0.04</filter-time>
</filter>
<filter>
<name>A/THR Knots Input Gain</name>
<type>gain</type>
<gain>1.0</gain>
<input>/it-autoflight/input/kts</input>
<output>/it-autoflight/internal/athr-kts-cmd</output>
<min>
<expression>
<max>
<property>/systems/fcc/speeds/vmin</property>
<difference>
<property>/instrumentation/airspeed-indicator/indicated-speed-kt</property>
<value>25</value>
</difference>
</max>
</expression>
</min>
<max>
<expression>
<min>
<property>/systems/fcc/speeds/vmax</property>
<sum>
<property>/instrumentation/airspeed-indicator/indicated-speed-kt</property>
<value>25</value>
</sum>
</min>
</expression>
</max>
</filter>
<filter>
<name>A/THR Knots Input Filter</name>
<type>noise-spike</type>
<initialize-to>output</initialize-to>
<input>/it-autoflight/internal/athr-kts-cmd</input>
<output>/it-autoflight/internal/athr-kts</output>
<max-rate-of-change>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<equals>
<property>/it-autoflight/output/thr-mode</property>
<value>0</value>
</equals>
<equals>
<property>/gear/gear[1]/wow</property>
<value>0</value>
</equals>
<equals>
<property>/gear/gear[2]/wow</property>
<value>0</value>
</equals>
</and>
</condition>
<value>10</value>
</max-rate-of-change>
<max-rate-of-change>200</max-rate-of-change>
</filter>
<filter>
<name>A/THR Max Command</name>
<type>gain</type>
<gain>1.0</gain>
<input>
<expression>
<max>
<property>/systems/engines/control-1/ats-max</property>
<property>/systems/engines/control-2/ats-max</property>
<property>/systems/engines/control-3/ats-max</property>
</max>
</expression>
</input>
<output>/it-autoflight/internal/ats-max</output>
</filter>
<pid-controller>
<name>IT-CONTROLLER: Knots</name>
<enable>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<equals>
<property>/it-autoflight/output/thr-mode</property>
<value>0</value>
</equals>
</and>
</condition>
</enable>
<input>/it-autoflight/internal/athr-kts-input-lag</input>
<reference>/it-autoflight/internal/athr-kts</reference>
<output>/systems/engines/ats-cmd-raw-pid</output>
<config>
<Kp>0.055</Kp>
<Ti>9.0</Ti>
<Td>0.00001</Td>
<u_min>/systems/engines/limit/idle-norm</u_min>
<u_max>/it-autoflight/internal/ats-max</u_max>
</config>
</pid-controller>
<filter>
<name>Speed Filter</name>
<type>noise-spike</type>
<feedback-if-disabled>true</feedback-if-disabled>
<initialize-to>output</initialize-to>
<enable>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<equals>
<property>/it-autoflight/output/thr-mode</property>
<value>0</value>
</equals>
</and>
</condition>
</enable>
<input>/systems/engines/ats-cmd-raw-pid</input>
<output>/systems/engines/ats-cmd-raw</output>
<max-rate-of-change>0.3</max-rate-of-change>
</filter>
<filter>
<name>IT-CONTROLLER: Idle Limit</name>
<type>noise-spike</type>
<initialize-to>output</initialize-to>
<enable>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<equals>
<property>/it-autoflight/output/thr-mode</property>
<value>1</value>
</equals>
</and>
</condition>
</enable>
<input>0</input>
<output>/systems/engines/ats-cmd-raw</output>
<max-rate-of-change>0.05</max-rate-of-change> <!-- RETARD mode is very slow apparently -->
</filter>
<filter>
<name>IT-CONTROLLER: Thrust Limit</name>
<type>noise-spike</type>
<initialize-to>output</initialize-to>
<enable>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<equals>
<property>/it-autoflight/output/thr-mode</property>
<value>2</value>
</equals>
</and>
</condition>
</enable>
<input>/it-autoflight/internal/ats-max</input>
<output>/systems/engines/ats-cmd-raw</output>
<max-rate-of-change>0.15</max-rate-of-change>
</filter>
<filter>
<name>Power Norm Engine 1</name>
<type>gain</type>
<gain>1.0</gain>
<input>
<condition>
<equals>
<property>/options/eng</property>
<value>PW</value>
</equals>
</condition>
<expression> <!-- EPR non-linearity makes it hard -->
<table>
<property>/engines/engine[0]/n1-actual</property>
<entry><ind> 24.7</ind><dep>0</dep></entry>
<entry><ind>105.0</ind><dep>1</dep></entry>
</table>
</expression>
</input>
<input>
<expression>
<table>
<property>/engines/engine[0]/n1-actual</property>
<entry><ind> 22.6</ind><dep>0</dep></entry>
<entry><ind>119.5</ind><dep>1</dep></entry>
</table>
</expression>
</input>
<output>/systems/engines/power-norm[0]</output>
</filter>
<filter>
<name>Power Norm Engine 2</name>
<type>gain</type>
<gain>1.0</gain>
<input>
<condition>
<equals>
<property>/options/eng</property>
<value>PW</value>
</equals>
</condition>
<expression> <!-- EPR non-linearity makes it hard -->
<table>
<property>/engines/engine[1]/n1-actual</property>
<entry><ind> 24.7</ind><dep>0</dep></entry>
<entry><ind>105.0</ind><dep>1</dep></entry>
</table>
</expression>
</input>
<input>
<expression>
<table>
<property>/engines/engine[1]/n1-actual</property>
<entry><ind> 22.6</ind><dep>0</dep></entry>
<entry><ind>119.5</ind><dep>1</dep></entry>
</table>
</expression>
</input>
<output>/systems/engines/power-norm[1]</output>
</filter>
<filter>
<name>Power Norm Engine 3</name>
<type>gain</type>
<gain>1.0</gain>
<input>
<condition>
<equals>
<property>/options/eng</property>
<value>PW</value>
</equals>
</condition>
<expression> <!-- EPR non-linearity makes it hard -->
<table>
<property>/engines/engine[2]/n1-actual</property>
<entry><ind> 24.7</ind><dep>0</dep></entry>
<entry><ind>105.0</ind><dep>1</dep></entry>
</table>
</expression>
</input>
<input>
<expression>
<table>
<property>/engines/engine[2]/n1-actual</property>
<entry><ind> 22.6</ind><dep>0</dep></entry>
<entry><ind>119.5</ind><dep>1</dep></entry>
</table>
</expression>
</input>
<output>/systems/engines/power-norm[2]</output>
</filter>
<pid-controller>
<name>System Command: Throttle 1</name> <!-- Simulates "hunting" -->
<enable>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
</enable>
<input>/systems/engines/power-norm[0]</input>
<reference>
<expression>
<min> <!-- For per engine manual EPR limit -->
<property>/systems/engines/ats-cmd-raw</property>
<property>/systems/engines/control-1/ats-max</property>
</min>
</expression>
</reference>
<output>/systems/engines/ats-cmd[0]</output>
<config>
<Kp>0.4</Kp>
<Ti>0.8</Ti>
<Td>0.0</Td>
<u_min>
<expression>
<max>
<difference>
<property>/systems/engines/power-norm[0]</property>
<value>0.1</value>
</difference>
<value>0</value>
</max>
</expression>
</u_min>
<u_max>
<expression>
<min>
<sum>
<property>/systems/engines/power-norm[0]</property>
<value>0.1</value>
</sum>
<value>1</value>
</min>
</expression>
</u_max>
</config>
</pid-controller>
<pid-controller>
<name>System Command: Throttle 2</name> <!-- Simulates "hunting" -->
<enable>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
</enable>
<input>/systems/engines/power-norm[1]</input>
<reference>
<expression>
<min> <!-- For per engine manual EPR limit -->
<property>/systems/engines/ats-cmd-raw</property>
<property>/systems/engines/control-2/ats-max</property>
</min>
</expression>
</reference>
<output>/systems/engines/ats-cmd[1]</output>
<config>
<Kp>0.4</Kp>
<Ti>0.8</Ti>
<Td>0.0</Td>
<u_min>
<expression>
<max>
<difference>
<property>/systems/engines/power-norm[1]</property>
<value>0.1</value>
</difference>
<value>0</value>
</max>
</expression>
</u_min>
<u_max>
<expression>
<min>
<sum>
<property>/systems/engines/power-norm[1]</property>
<value>0.1</value>
</sum>
<value>1</value>
</min>
</expression>
</u_max>
</config>
</pid-controller>
<pid-controller>
<name>System Command: Throttle 3</name> <!-- Simulates "hunting" -->
<enable>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
</enable>
<input>/systems/engines/power-norm[2]</input>
<reference>
<expression>
<min> <!-- For per engine manual EPR limit -->
<property>/systems/engines/ats-cmd-raw</property>
<property>/systems/engines/control-3/ats-max</property>
</min>
</expression>
</reference>
<output>/systems/engines/ats-cmd[2]</output>
<config>
<Kp>0.4</Kp>
<Ti>0.8</Ti>
<Td>0.0</Td>
<u_min>
<expression>
<max>
<difference>
<property>/systems/engines/power-norm[2]</property>
<value>0.1</value>
</difference>
<value>0</value>
</max>
</expression>
</u_min>
<u_max>
<expression>
<min>
<sum>
<property>/systems/engines/power-norm[2]</property>
<value>0.1</value>
</sum>
<value>1</value>
</min>
</expression>
</u_max>
</config>
</pid-controller>
<filter>
<name>System Command: Throttle Inactive Sync</name>
<type>gain</type>
<gain>1.0</gain>
<enable>
<condition>
<or>
<not-equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</not-equals>
<equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</equals>
</or>
</condition>
</enable>
<input>/systems/engines/throttle-compare-max</input>
<output>/systems/engines/ats-cmd[0]</output>
<output>/systems/engines/ats-cmd[1]</output>
<output>/systems/engines/ats-cmd[2]</output>
<output>/systems/engines/ats-cmd-raw</output>
</filter>
<!-- Engine 1 -->
<filter>
<name>System Command: Throttle 1 Filter</name>
<type>noise-spike</type>
<initialize-to>output</initialize-to>
<input>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
<property>/systems/engines/ats-cmd[0]</property>
</input>
<input>/controls/cockpit/throttle-lever[0]</input>
<output>/systems/engines/ats-cmd-1</output>
<max-rate-of-change>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
<value>0.2</value>
</max-rate-of-change>
<max-rate-of-change>100</max-rate-of-change>
</filter>
<filter>
<name>System Command: Throttle Backdrive 1</name>
<type>gain</type>
<gain>1.0</gain>
<enable>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
</enable>
<input>/systems/engines/ats-cmd-1</input>
<output>/controls/engines/engine[0]/throttle</output>
</filter>
<!-- Engine 2 -->
<filter>
<name>System Command: Throttle 2 Filter</name>
<type>noise-spike</type>
<initialize-to>output</initialize-to>
<input>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
<property>/systems/engines/ats-cmd[1]</property>
</input>
<input>/controls/cockpit/throttle-lever[1]</input>
<output>/systems/engines/ats-cmd-2</output>
<max-rate-of-change>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
<value>0.2</value>
</max-rate-of-change>
<max-rate-of-change>100</max-rate-of-change>
</filter>
<filter>
<name>System Command: Throttle Backdrive 2</name>
<type>gain</type>
<gain>1.0</gain>
<enable>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
</enable>
<input>/systems/engines/ats-cmd-2</input>
<output>/controls/engines/engine[1]/throttle</output>
</filter>
<!-- Engine 3 -->
<filter>
<name>System Command: Throttle 3 Filter</name>
<type>noise-spike</type>
<initialize-to>output</initialize-to>
<input>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
<property>/systems/engines/ats-cmd[2]</property>
</input>
<input>/controls/cockpit/throttle-lever[2]</input>
<output>/systems/engines/ats-cmd-3</output>
<max-rate-of-change>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
<value>0.2</value>
</max-rate-of-change>
<max-rate-of-change>100</max-rate-of-change>
</filter>
<filter>
<name>System Command: Throttle Backdrive 3</name>
<type>gain</type>
<gain>1.0</gain>
<enable>
<condition>
<and>
<equals>
<property>/it-autoflight/output/athr</property>
<value>1</value>
</equals>
<not-equals>
<property>/it-autoflight/output/thr-mode</property>
<value>3</value> <!-- Clamp -->
</not-equals>
</and>
</condition>
</enable>
<input>/systems/engines/ats-cmd-3</input>
<output>/controls/engines/engine[2]/throttle</output>
</filter>
</PropertyList>